Door for conveyers.



PATENTED OCT. 16, 1906'.

M. G. SGHWAB. DOOR FOR GONVEYBRS. nruoumn nun NOV. 2. 1904. RENEWED JULY 13,1905.

WITNESSES:

ATTORNEY nu NORRIS FITIIJ'CO., wasnmcrou, n. ::v

UNITED STATES PATENT OFFICE.

MARTIN o. SCHWAB, OF BA T MORE, MARYLAND, ASSIGNOR TOGRAVITY CONVEYORGOMPANY, ACORPORATION OF NEW YORK.

boon FOR QO'NVEYERS.

Specification of Letters Patent.

Patented Oct. 16, 1906.

Application filed November 2; 1904. Renewed July 13,1905. Serial No. 269,572.

To all whom it may concern.-

Be it known that I, MARTIN O. SCHWAB, a citizen of the United States, residing at the city of Baltimore, State of Maryland, have invented certain new and useful Improvements in Doors for Conveyers, ofwhich the following is a specification.

My invention relates to doors for conveyers, and'more especially for gravity-conveyers of the spiral type. i

I will describe a conveyer embodying my invention and point out the novel features thereof in claims.

In the drawings, Figure 1 is a sectional elevation of a spiral ravity-conveyer with my invention attache Fig. 2 is a plan view of a section taken through the line A B of Fig. 1. Fig. 3 is a plan view of a section taken through the line C D of Fig. 1.

Like characters of reference indicate cor responding parts in all of the fi ures.

is a spiral chute or pac age-conveyer comprising an outer casing or shell 11, a spiral 12 inside of and attached to this shell and surrounding an inner hollow core or shell 13, to which it is also secured.

20, 30, and designate different landings or floors of a building which are connected by the conveyer.

21, 31, and 41 designate openings in the outer shell 11, which afford communication between the floors and the conveyer. 22, 32, and 42 are doors arranged to cover these openings when they are not in use. When these doors are closed, they virtually form a part of the outer shell. The door 22 is arranged to close automatically, as will be pointed out fully hereinafter, and the doors 32 and 42 are arranged to perform another function than that of closing the openings, which I will now describe. These doors 32 and 42 are pivoted at 34 and 44 to points near the bottom of the openings. They are so arranged that when they are in a vertical position, as shown in the drawing of the door 42, they will close the openings. When it is desired to open these doors, so as to gain access to the inside of the conveyer, they may be tilted back, as shown in the drawing of the door 32. Counterweights may be added, if desired, to facilitate the operation of the doors. Means are provided to hold the doors in the proper position when they are thus tilted back. I have shown, to illustrate the which is preferably on an incline.

their open position.- The first of these means comprises a chain 35, which is attached to the outer shell 11 of the'conveyer at 36 and to the door 32 ,at 37. The other of these means comprises a bracket-38, attached to the landing 30 and placed in such a position that when the door 32 is tilted back against it it will be held by the bracket in sired position. opened, they are held in the desired position, The inner surface is slightly above the bottom of the opening near which they are placed, so that they themselves form chutes or inclined shelves leading into the conveyer. When packages are placed upon these inclines, they will slide into the conveyer and descend by gravity along the surface of the spiral 12.

The lower edges of the openings 31 and 41 are preferably placed above the level of the spiral at the landings 30 and 40, so that they will not interfere wlth the passage of parcels which have been placed in the conveyer at some point above them.

The door 22, which is shown directly over the landing 21, is held in its open position by means of a chain 25, which is attached to the outer shell 11 of the conveyer at 26 and to the door itself at 27. In this chain is interposed a fuse-link 28, which is so made that it will melt when it is exposed to an abnormal temperature and to allow the door 22 to fall by ravity and to close the opening 21. To faci itate this, a weight 29 is sometimes added to the outer surface of the door 22. It is obvious that in case of fire this door will automatically close by the melting of the fuse-link, and so prevent the spread of flames up into the building through the conveyer.

Having described my invention, what I claim is- 1. The combination with a conveyer provided with an opening, of a door pivoted at or near the bottom of the openin and a bracket for normally supporting said door in an inclined position to form a chute or inclined shelf leading into the conveyer.

2. The combination with a conveyer having an opening therein, of a door pivoted at or near the lower portion of said opening, a bracket for normally supporting said door on an inclined position to form a chute for conveying articles into the conveyer, and means invention, means for holding these doors in the de- When the doors then are ICC 3. The combination wlth a conveyer', of a' landing, a door pivoted at or near the upper edge oi an opening in the conveyer and above said landing, means comprising a iusiblemember for supporting said door in open position, and means attached to the d'oor'to assist the same in automatically closing upon the fusing of said member.

4. The combination with a spiral gravityconveyer comprising an outer casing and an inelosedsiral way, of a door pivoted at or near the ower edge of an opening in said outer casing and above said spiral way, and means for supporting said door in an open position to form a chute leading to said spiral way. v p

i The combination with a spiral gravityconveyer comprising an outer tubular casing and an inclosed spiral way, of a door conforming to the shape of the outer casing and pivoted above the spiral way at or near the lower edge of an opening in said outer casing, and means for supporting said door in an openposition to form a chute leading to said spiral way.

6. The combination with a spiral gravitycon-veyer comprising an outer shell and an inclosed spiral way, of landings below openings in said outer shell, a plurality of pivoted doors one for each of said openings, means for supporting said doors in open position to form chutes leading throughthe intake'openings to said spiral way, an additional pivoted door for the exit-opening, and means comprising a fusible member for normally supporting said door in open position.

In witness whereof I have signed my namein the presence of two subscribing witnesses.

MARTIN O. SOHWAB.

Witnesses:

IsAAo ARNBUM, J. E. GRANBERG. 

